共查询到18条相似文献,搜索用时 406 毫秒
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胶乳型互穿聚合物网络(LIPN)阻尼材料 总被引:8,自引:0,他引:8
详细讨论了LIPN体系的阻尼原理。高分子材料在发生玻璃化转变时,大分子链段在玻璃化转变温度Tg附近的运动可以把振动能转化为热能耗散掉,借此可以达到减振、降噪的目的。这也是LIPN作为阻尼材料的依据。阻尼笥能是分子运动的结果,LIPN组分间的相容性及相互作用是影响阻尼性能的重要因素;采用不同的合成方法,将形成不同的微观形态,也会导致材料阻尼性能的差异。因此本文又深入探讨了各种合成参数及合成条件对体系性能的影响,并且指出了合成过程中特别需要注意的几个问题。 相似文献
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自从Farmer,Saunderson等引入光谱分析的光电方法(常简称光电光谱法)以来,各国对于这一先进技术都予以很大的重视。在我国,利用光电宣读光谱仪,对钢铁、有色金属、气体以及其他物质材料中的各种杂质元素的快速测定,逐渐广泛开展起来,已在生产及科学研究中发挥了显著的成效。为了使这一先进技术进一步推广与发展,在 相似文献
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粘弹性阻尼材料中互穿聚合物网络技术的应用 总被引:3,自引:0,他引:3
阐述了粘弹性材料在振动波作用下的阻尼机理,指出声波法和模量法的统一性。综述了互穿聚合物网络技术要点,并解释相分离体系宽玻璃化转变区间的形成机理;介绍了互穿聚合和网络技术形成的新途径及梯度互穿聚合物网络技术要点。 相似文献
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PMPS/PMAc相容性与同步互贯聚合物网络的阻尼性能研究 总被引:5,自引:0,他引:5
互贯聚合物网络是一种聚合物合金 ,其组分的热力学性质决定组分间的相容性和微相结构 ,从而影响材料的阻尼性能 .采用同步互贯聚合物网络 (SIN)技术制备了一种新型的聚苯基硅氧烷 (PMPS) 聚甲基丙烯酸酯 (PMAc)阻尼材料 ,用DMA和AFM等表征研究了其玻璃化温度转变行为与微观相态结构 .结果表明 ,由相容性好的组分制备的SIN材料阻尼值最高 ,tanδmax 可达 1 4,只有一个玻璃化温度转变峰 ,其微相结构为双相连续 ;组分介于相容与不相容之间时 ,所构成的SIN样品的tanδ≥ 0 3的温度区间最宽 ,可达 170℃ ,微相结构为单相连续 ;由相容性差的组分制得的SIN阻尼材料的内耗峰裂分为两个区间 .PMPS PMAcSIN材料的阻尼性能可以通过调节组分的相容性进行控制 . 相似文献
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P(VA-co-DBM)/PVA乳胶IPN阻尼材料的合成及动态力学性能 总被引:3,自引:0,他引:3
用种子乳液聚合法合成了聚(醋酸乙烯酯-co-马来酸二丁酯)/聚醋酸乙烯酯乳胶互穿聚合物网络阻尼材料,动态力学谱结果表明,该阻尼材料在较宽的温域具有很高的阻尼因子。 相似文献
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Dong Wang Huan Zhang Jing Guo Beichen Cheng Yuan Cao Shengjun Lu Ning Zhao Jian Xu 《Macromolecular rapid communications》2016,37(7):655-661
Designing gradient structures, mimicking biological materials, such as pummelo peels and tendon, is a promising strategy for developing advanced materials with superior energy damping capacities. Here a facile and effective approach for fabricating polymers with composition gradients at millimeter length scale is presented. The gradient thiol‐ene polymers (TEPs) are created by the use of density difference of ternary thiol‐ene‐ene precursors and the subsequent photo‐crosslinking via thiol‐ene reaction. The compositional gradients are analyzed via differential scanning calorimeter (DSC), compressive modulus testing, atomic force microscopy (AFM) indentation, and swelling measurements. In contrast to homogeneous TEPs networks, the resultant gradient polymer shows a broader effective damping temperature range combining with good mechanical properties. The present result provides an effective route toward high damping materials by the fabrication of gradient structures.
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The damping property of magnetorheological (MR) elastomers is characterized by a modified dynamic mechanical-magnetic coupled analyzer. The influences of the external magnetic flux density, damping of the matrix, content of iron particles, dynamic strain, and driving frequency on the damping properties of MR elastomers were investigated experimentally. The experimental results indicate that the damping properties of MR elastomers greatly depend on the interfacial slipping between the inner particles and the matrix. Different from general composite materials, the interfacial slipping in MR elastomers is affected bythe external applied magnetic field. 相似文献
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To capture viscoelastic behavior of polymeric damping materials based on limited dynamic mechanical analysis tests, a simple fractional temperature spectrum model representing the viscoelastic materials is proposed in this paper and experimental tests aims at stressing the validity of the model. The storage modulus, the loss modulus, and the loss factor, are established based on the five-parameter fractional derivative model and the time–temperature superposition principle. The dynamic mechanical tests of two polymeric materials are carried out to verify this temperature spectrum model. Results indicate a good agreement between the temperature spectrum model and experimental tests at various temperature conditions. Furthermore, thermodynamic coupling of the viscoelastic material is investigated by temperature rise calculation and vibration experiment test. Comparison analysis shows that the temperature rise model can simulate the temperature rise process for the shear vibration of the constrained damping, which provide references for the damping capability, thermal damage and failure of viscoelastic material. 相似文献
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